#coding=utf-8 def pretty_dict(obj, indent=' '):  def _pretty(obj, indent):   for i, tup in enumerate(obj.items()):    k, v = tup    #如果是字符串則拼上""    if isinstance(k, basestring): k = '"%s"'% k    if isinstance(v, basestring): v = '"%s"'% v    #如果是字典則遞歸    if isinstance(v, dict):     v = ''.join(_pretty(v, indent + ' '* len(str(k) + ': {')))#計(jì)算下一層的indent    #case,根據(jù)(k,v)對(duì)在哪個(gè)位置確定拼接什么    if i == 0:#開(kāi)頭,拼左花括號(hào)     if len(obj) == 1:      yield '{%s: %s}'% (k, v)     else:      yield '{%s: %s,/n'% (k, v)    elif i == len(obj) - 1:#結(jié)尾,拼右花括號(hào)     yield '%s%s: %s}'% (indent, k, v)    else:#中間     yield '%s%s: %s,/n'% (indent, k, v)  print ''.join(_pretty(obj, indent))  d = { "root": { "folder2": { "item2": None, "item1": None }, "folder1": { "subfolder1": { "item2": None, "item1": None }, "subfolder2": { "item3": None } } } } pretty_dict(d)